Nail brush base



FIG. 1 is a perspective view of an embodiment of a nail brush base showing my new design;

FIG. 2 is a side elevation view thereof;

FIG. 3 is another side elevation view thereof;

FIG. 4 is an end elevation view thereof;

FIG. 5 is another end elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The dash-dash-dash type broken lines in the Figures are for the purpose of illustrating unclaimed portions of the nail brush base and form no part of the claimed design. 

CLAIM The ornamental design for a nail brush base, as shown and described. 